Sunshine Butterflies - Attachment D - 010816-2

                              OUR BACKYARD
                              468 MCKINNON DRIVE, COOROIBAH

3.2       Laboratory Testing
Selected soil samples were dispatched to Geotech (SC) Pty Ltd, a NATA accredited geotechnical laboratory
located in Kawana, for geotechnical testing. Laboratory testing was undertaken in accordance with
Australian Standard AS1289 Method for Testing Soils for Engineering Purposes and comprised:

       Shrink-Swell Index (1 No.) for soil reactivity to moisture content change.
       CBR, single point, four day soaked (2 No.) for pavement subgrade assessment.
Laboratory test results are summarised in Section 5.3. The laboratory test certificates are attached in
Appendix B.



4.0      THE SITE
The site is described as Lot 2 on RP214534 and covers a total area of 2.02 ha. As shown in Text Figure 2
below, the property has frontage to McKinnon Drive along the southern boundary and is otherwise
surrounded by rural residential properties.




Text Figure 2: 2015 aerial photograph of site (courtesy Qld Globe)


At the time of investigation, the western part of the property was occupied by a single storey house with
surrounding sheds and gravel tracks/car parking areas. The remainder of the site was covered by paddocks
with short grass coverage and scattered mature trees. The proposed development area slopes gently to the
east/north-east at less than 5°, eventually draining into three small dams in the north-eastern corner.
A small concrete septic tank (1.7 m diameter at the surface), having an estimated 4,000 L capacity, is
located adjacent to the north-western corner of the existing house. The septic tank drains to an absorption
trench in an open grassed area to the east of the house. Based upon observations of seepage at the
surface, it appeared that the trench was failing at the time of our visit. Inspection of the septic tank revealed
that it was full. We understand that the tank had never been pumped out by the current owners, thus likely
causing overflow of sludge into the trenches, possibly leading to the observed failure.
Text Figures 3 to 6 on the following pages illustrate the site conditions at the time of our investigation.




4 May 2016
Report No. 16081-001-Rev0                                2